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The Machchhu dam failure or Morbi disaster is a dam-related flood disaster which occurred on 11 August 1979. The Machchu-2 dam, situated on the Machchhu river, failed, sending a wall of water through the town of Morbi (now in the Morbi district) of Gujarat, India.[1] Estimates of the number of people killed vary greatly ranging from 1,800 to 25,000 people.[2][3][4]
The Machchu II dam
The first dam on Machchhu river, named Machchhu I, was built in 1959 having catchment area of Template:Convert. The Machchhu II dam was constructed at downstream of Machchhu I in 1972 and has a catchment area of Template:Convert.[5]
It was a earthfill dam. The dam was meant to serve an irrigation scheme. Considering the long history of drought in Saurashtra region, the primary purpose consideration at the time of design was water supply, not flood control. It consisted of a masonry spillway of Template:Convert consisting 18 sluice gates across the river section and long earthen embankments on both sides. The spillway capacity provided for Template:Convert.[6] The embankments were of Template:Convert and Template:Convert of length on left and right side respectively.[7] The embankments had a 6.1 m top width, with upstream and downstream slopes 1:3 (V:H) and 1:2 respectively; and a clay core extending through alluvium to bedrock. The upstream face consisted of 61 cm small gravel and a 61 cm hand packed rip-rap. The dam stood Template:Convert above the river bed and its overflow section was Template:Convert long. The reservoir had a storage capacity of Template:Convert.[8]
Failure
The failure was caused by excessive rain and massive flooding leading to the disintegration of the earthen walls of the four kilometre long Machchhu-2 dam. The actual observed flow following the intense rainfall reached 16,307 m3/s, thrice what the dam was designed for, resulting in its collapse. The Template:Convert of left and Template:Convert of right embankment of dam were collapsed.[7] Within 20 minutes the floods of Template:Convert height inundated the low-lying areas of Morbi industrial town located 5 km below the dam.[6]
Around 3.30 pm the tremendous swirling flow of water stuck the Morbi. Water level rises to Template:Convert within next 15 minutes and some low lying areas of city were under Template:Convert of water for next 6 hours.[1]
The Morbi dam failure was listed as the worst dam burst in the Guinness Book of Records[9] (before the death toll of the 1975 Banquiao Dam failure was declassified in 2005).[10] The book No One Had A Tongue To Speak by Tom Wooten and Utpal Sandesara debunks the official claims that the dam failure was an act of God and points to structural and communication failures that led to and exacerbated the disaster.[11] There was great economic loss. The flood damaged the farmland, leading to a decrease in productivity of crops.
The book by Wooten and Sandesara gives a vivid first person account of many survivors. It narrates how people scrambled for rooftops, hilltops, and other safe grounds in order to save themselves. Over a hundred people took shelter in Vajepar Ram Mandir but later the deluge submerged them with the temple. Women were compelled to drop their babies into the furious surge in order to save themselves and people lost their loved ones in a flash.[12]
During reconstruction of the dam the capacity of the spillway was increased by four times and fixed at about 21,000 m3/s.[6]
Popular culture
The upcoming Gujarati disaster film Machchhu is based on the Machchu dam failure.[13]
References
- ↑ 1.0 1.1 The Inundation of Morvi. Economic and Political Weekly({Template:Date).
- ↑ Dissolving Commissions of Inquiry. Economic and Political Weekly({Template:Date).
- ↑ Environmental assessment sourcebook{{#if:|, {{{last}}}}. World Bank Publications(1991). ISBN 978-0-8213-1845-4
- ↑ The Loudest Crash Of '79. Outlook India(27 August 2012).
- ↑ Machchhu River. Narmada, Water Resources and Water Supply Department, Government of Gujarat.
- ↑ 6.0 6.1 6.2 Polavaram Dam Failure Kills 45 Lakhs of People.
- ↑ 7.0 7.1 Safari Magazine, Issue 173, Vijay, Nagendra. Scribd(October 2008). Retrieved 2020-08-03.
- ↑ RCEM Case History Compilation.
- ↑ Guinness, El Libro de los Récords{{#if:|, {{{last}}}}. Ediciones Maeva, S.A.(October 1986). ISBN 978-968-458-366-5
- ↑ People's Daily Online -- After 30 years, secrets, lessons of China's worst dams burst accident surface. Retrieved 2018-04-26.
- ↑ Book on 1979 Morbi dam disaster rubbishes 'Act of God' theory. The Indian Express(25 July 2012).
- ↑ Machhu dam disaster of 1979 in Gujarat – Discussion on a book by Tom Wooten and Utpal Sandesara.
- ↑ Machchhu: A real life tragic story is all set to release - Times of India. The Times of India. Retrieved 2020-04-19.